Jahangir Alam’s Post

Ever wondered why your JavaScript app slows down… even when your code looks “clean”? 🤔 It might not be your logic. It might be memory. JavaScript uses Garbage Collection to automatically free memory. Sounds great, right? But here’s the catch... it’s not magic. If you keep unnecessary references (like unused variables, closures, or DOM nodes), the Garbage Collector can’t clean them. That’s how memory leaks quietly grow… and kill performance. I learned this the hard way while optimizing a real-time app. Fixing just a few hidden references improved speed significantly. 👉 Key takeaway: Write code that lets go of memory when it’s no longer needed. Smart developers don’t just write features... they manage resources. Sharing more insights like this on webdevlab.org 🚀 Are you writing code that scales… or code that slowly breaks under pressure? #JavaScript #WebDevelopment #FullStack #Programming #Performance #CleanCode #Developers

⚔️ Zustand vs Redux Toolkit (simple take) 🟢 Use Zustand when: • App is small or medium • You want less code, quick setup • State is simple • Working solo or in a small team const useStore = create((set) => ({ count: 0, increment: () => set(state => ({ count: state.count + 1 })) })); 🔵 Use Redux Toolkit when: • App is large • Team needs clear structure • You want powerful DevTools (debugging, history) • Handling complex async logic ⚖️ Truth: Both are great — just pick what fits your project. 🚀 Starting fresh? Zustand (UI state) + React Query (API data) → Works for most apps with less complexity 📌 Bottom line: Redux isn’t bad — just sometimes more than you need. 💬 What do you use? #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #StateManagement #Redux #ReduxToolkit #Zustand #ReactQuery #SoftwareDevelopment #Programming #Developers #TechCommunity

Setting up a monorepo is usually a straightforward task. You just run a simple command to generate the initial setup, and it feels like everything is ready to go. But in practice, that’s rarely the case. The setup looks complete as soon as the generation finishes, but what you actually get is a ready-to-use boilerplate that includes a web application and a documentation app, along with shared packages for UI components and configuration. At this stage, you simply install the dependencies, and you already have a working Next.js web application along with a ready-to-use Next.js documentation app. But what if you want to add another application to this structure? Here I will focus on two cases, but the same approach applies to any framework or library you might want to add: NestJS and Django.

🚀 Excited to share something I built for the React Native community! Over the past 3+ years working with React JS and React Native, I’ve built multiple reusable components to simplify development and maintain consistency across projects. One of those is now published on npm: 👉 react-native-form-textinput This is a TextInput component built specifically to work smoothly with React Hook Form — helping you write less code while handling forms more efficiently. 🔹 What it offers: • Seamless integration with React Hook Form • Reduces boilerplate code in forms • Built-in validation & error handling • Clean and reusable structure • Easily customizable UI I’ve been using this in my own projects, and it has significantly improved development speed and code quality. 🔗 NPM: https://lnkd.in/dV9UyR_G 💻 GitHub: https://lnkd.in/drZ_GM_F I’m planning to improve this package further 🚀 If you have suggestions, ideas, or want to contribute, feel free to open an issue or PR on GitHub. Would really appreciate your feedback 🙌 #ReactNative #JavaScript #OpenSource #NPM #MobileDevelopment #MERN #Developers

🚀 Leveling up my React skills: Building a Dynamic Quiz App! I just finished building a fully functional Quiz Application, and it was a fantastic deep dive into some of the more nuanced parts of React. What started as a simple UI project turned into a great lesson in state management and component lifecycles. Key things I learned/implemented: ✅ Mastering Effects & Cleanups: I implemented a QuestionTimer using useEffect to handle both a countdown progress bar (via setInterval) and a timeout logic (via setTimeout). Learning to properly clean up these side effects was crucial to avoid memory leaks! ✅ The Power of the key Prop: One of the "aha!" moments was using the key prop to reset component state. By passing key={activeQuestionIndex} to my timer component, I ensured it completely resets and restarts for every new question without complex manual logic. ✅ Optimization with useCallback: To prevent unnecessary re-renders and ensure stable function references for my effects, I utilized useCallback. This was essential for keeping the timer logic precise while passing handler functions down through props. ✅ Derived State: Instead of creating redundant state variables, I practiced deriving the "current question" logic directly from my existing answers array, keeping my state lean and predictable. This project was a great reminder that even "simple" features like a progress bar require a solid understanding of how React handles timing and component instances. Check out the snippet of my QuestionTimer logic below! 👇 #ReactJS #WebDevelopment #Frontend #CodingJourney #JavaScript #ReactHooks #Programming

🚀 Still managing state the old way in your React apps? Let’s talk about it. When I started with React, I used to: 👉 Pass props through multiple components 😵 👉 Keep all state in one place 👉 Create messy and hard-to-track logic It worked… but it wasn’t scalable. 💡 Old Way (Prop Drilling): ❌ Passing props deeply ❌ Hard to maintain ❌ Components tightly coupled 💡 Modern React (Better State Management): ✔ Context API / Zustand / Redux ⚡ ✔ Clean and reusable components ✔ Better separation of concerns ✔ Scalable architecture 💡 Example: // ❌ Old (Prop Drilling) function App() { const [user, setUser] = useState(null); return <Dashboard user={user} />; } function Dashboard({ user }) { return <Profile user={user} />; } function Profile({ user }) { return <h1>{user.name}</h1>; } // ✅ New (Context API) // context/UserContext.js export const UserContext = createContext(); // App.js <UserContext.Provider value={user}> <Dashboard /> </UserContext.Provider> // Profile.js const user = useContext(UserContext); return <h1>{user.name}</h1>; 🎯 Result: ✔ Cleaner components ✔ Easier state management ✔ Better scalability 🔥 Lesson: React isn’t just about components — it’s about managing state the right way. Are you still using prop drilling or moved to modern state management? 👀 #ReactJS #Frontend #WebDevelopment #JavaScript #CleanCode #Programming

If you're learning React and still confused about hooks… You're not alone. 👉 A lot of people know how to use hooks, but not when to use them. And that’s where things start going wrong. Here are 5 React hooks that actually matter 👇 🔹 useState Manages component state and triggers re-render when data changes. Used in almost every app , but overusing it can make your logic messy. 🔹 useEffect Handles side effects like API calls and external updates. Most misused hook , bad dependencies = bugs + performance issues. 🔹 useRef Stores values without causing re-renders and accesses DOM directly. Super useful for focus control, timers, and tracking previous values. 🔹 useContext Removes prop drilling by sharing data across components. Great for global state , but don’t treat it like a full state manager. 🔹 useNavigate Controls navigation programmatically inside your app. Commonly used for redirects after login, logout, or form actions. --- Here’s the truth 👇 React isn’t hard. Bad understanding of hooks is. Stop memorizing. Start building. 💬 Which hook confused you the most when you started? #ReactJS #FrontendDeveloper #JavaScript #MERNStack #WebDevelopment #Coding #LearnInPublic

⚛️ Common React Mistakes That Are Killing Your Performance 💀 You think your React code is fine… . But these small mistakes are silently breaking your app 👀 Here’s what most developers still do wrong 👇 . ❌ Mutating state directly React won’t re-render properly (page 2)  ❌ Using index as key Leads to weird UI bugs when list updates (page 3)  ❌ Too much global state Unnecessary re-renders & messy logic (page 4)  ❌ useEffect misuse Missing dependency array = infinite loop 🔁 (page 5)  ❌ Storing derived state You’re duplicating logic for no reason (page 6)  ❌ Too many re-renders New objects/functions every render = performance drop (page 7)  ❌ Ignoring loading & error states Your UI breaks when API fails (page 8)  ❌ Poor folder structure Good code needs good organization (page 9)  . 🔥 React isn’t hard… Bad practices make it hard 💬 Clean code = scalable apps 📌 Save this before your next project . More Details Visit: https://lnkd.in/gRVwXCtq Call: 9985396677 | info@ashokit.in. . #ReactJS #Frontend #WebDevelopment #JavaScript #Coding #Developers #Programming #SoftwareEngineering

26 questions. The difference between knowing React on paper and surviving a real production codebase. Here are the 26 questions categorized by the depth of experience required: Level 1: The Foundations => How does React’s rendering process work? => What’s the difference between state and props? => What are hooks, and why were they introduced? => What are controlled vs uncontrolled components? => When would you use refs? => How do you handle forms and validations? Level 2: State & Logic => When should you lift state up? => How do you manage complex state in an application? => When would you use useState vs useReducer? => How do useEffect dependencies work? => How do you handle API calls (loading, error, success states)? => How do you manage shared state across components? => Context API vs Redux — when would you use each? Level 3: Performance & Scale => What causes unnecessary re-renders, and how do you prevent them? => What is memoization in React? => When would you use React.memo, useMemo, and useCallback? => How do you structure a scalable React application? => How do you optimize performance in large-scale apps? => What tools do you use to debug performance issues? => How do you secure a React application? => How do you test React components effectively? Level 4: The War Stories => Have you faced an infinite re-render issue? How did you fix it? => Tell me about a complex UI you built recently. => How did you improve performance in a React app? => What’s the hardest bug you’ve fixed in React? => How do you handle 50+ inputs in a single form without lag? Syntax is easy to Google. Deep understanding is hard to fake. #ReactJS #FrontendDevelopment #TechInterviews #JavaScript #WebDevelopment #Developers

Ever wondered what actually happens inside React when your app updates? React does not directly change the browser UI every time something updates. Instead, it creates a Virtual DOM, which is a lightweight copy of the real DOM. When data changes, React builds a new Virtual DOM and compares it with the previous version. This process is known as reconciliation. • React checks what has changed between two versions • It updates only those specific parts in the real DOM • This makes updates faster and avoids unnecessary reloading React also follows a component-based structure. Each component manages its own state and logic, making the code easier to understand, reuse, and maintain. When state or props change, React decides when and how to re-render efficiently. This is why React applications stay fast even when they become large and complex. For more details, go to the link and see the full post: https://lnkd.in/eU-YtJw7 #React #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #Programming #SoftwareEngineering #MERNStack